Alex bernstein



(Ho Model.) l

A. BERNSTIN.

y ELECTRIC INGANDBSGBNT IAMP. No. 258,976. `APaien'ed June 6,1882.

WITNBSSES: INVBNTOR z ATTORNEY UNITED STATES hnrsNT @Fries ALEX BEnNs'rE1N,oF New YORK, N.- Y.

sLscTmc mcAnDssoEr-:T LAMP.

SPECIFICATION fox-ming part of Lettera Patent No. B,976,'deted Tune 6, 1882.

Appllcntionliled December 24, 1881. (No model.) p

To all whom it may concern Be it known that I, ALEX BnsNsTEIN, of the city, county, and State of New York, have invented certain new and useful Improvements in Electric Incandescent Lamps, of which the zo action of strong currents, so as to impart a high degree of eticacy and permanency to the lamp.

The invention consists of an electric lamp the lightgiving part of which is made ot' any z 5 substance having the property ot' phosphoresceuce, and which is either entirely or partly covered with a deposit or tilxn ot' carbon.

In theaccompanyingdrawings,Figure 1 represenls a vertical central section ot' an electric 3o lamp constructed according to my invention. Fig. 2 is a horizontal section of the same on line afar, Fig. 1; and Figs. 3 and 4 are details of the same.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, A represents the bulb or globe which incluses the light-giving part of my improved electric lamp, and B the stopperor closing part,which is sealed into the 4o neck of thc bulb. The bulb is evacuated in the usual manner through a central tube or channel, a, of the stopper B. The platinum conductingwires C C are sealed into an annular collar, b,ot' the stopper, Whichcollari:| arrau ged at some distance belowihe upper end of the ceutralupward-cxtended portionof the stopper, so as to be little if at all affected by the heat emitted by the light-giving part. The conductin g-wires C C may also be sealed tothe upper- 5o moet end of the central portion of the stopper 'the light-giving part D-be only partly covered if it be desired to increase the stability of the former. The wires are then spread apart, so

as to clamp the light-giving part D, by means otenlnrged ends C. The lightgiving part D is made of oval, cylindrical, spherical, oblong, or any other shape, and composed of any substance having the property of phosphorescence--such as calcined egg or oyster shells, chalk,lime,duorspar, the compounds ot strontium,magnesium,calcium,&c. Th'islight-giving partD is partly or entirely covered with a film of carbon, which is deposited thereon by chemical ormechauical means, said tilm serving to conduct the current from one wire to the other, while the substratum of phosphoresceut material serves as a. support or carrier. for the film of carbon and prevents the destruction of the same. The substratum or carrier has the properties ot' non-fusibility and non-con dnctivity, and is heated .up by the intense heat of the current, so as to forma luminous body the light of which does not appear when the carrier is entirely covered with carbon, while it is clearly discernible at that part which is not covered with carbon. The large surface of the incandescent film of carbon furnishes a large light-giving surface, and consequently lamps of greatercandlepowerthancan be t'urnished by lamps with carbon larnents. It

8o with carbon, as in the cnseof suspended lamps, (shown in Fig.4,)the covered portion will emit an intense light, while the remaining portion will emit a. much softer light, which is due to the heating up of this part by theAcarbou-covered portion.

It' the lamp be used for a wall-lamp, the front half ot' the light-giving part is covered with carbon, so as to emit a strong light in front and acomparatively Weak light at the rear.

The essential advantages ot' a lamp ot' this construction will be its freedom from acciden tal destruction, its greater economy both as to construction and as to light-giviugpower,and the higherillnminating power which iscapable of 95. beiugobtained by reason of theincreased lightemitting surface. y

Having thusdescribed my invention, I claim as new and desire to-secnre by Letters Patent- 1. In an' electric lempbesedon the princiroo ple of incandescence, a light-giving part oomposed of a non-conducting and infusible carrier and of a lm or deposit of carbon covering partly or entirely the surface of the carrier,

Vsubstantially as set forth.

2. In an electrio lamp, the combination of the conductingwires having enlarged end vclamps with a. lightgiving part supported a bulb, A, having n centrally-channeled stopl per, B, of conducting-wires() C, sealed into a r 5 .collar of the stopper below the upper end of the same, and adapted to support the liglitgiving pari; D, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed my name in pres- 2o ence of two subscribing witnesses.

ALEX BERNSTEIN.

Wit nesses PAUL GoEPEL,

CARL KARP. 

